/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraComponent.h
Called on when an external object wishes to force this System to reinitialize itself from the System data.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=Niagara, Meta=(DisplayName="Reinitialize System")) void ReinitializeSystem()